Forever negative opk

I have been taking my opk since 13 days after my last period it's almost been a full month of taking them with no smiley face, I have always had an irregular period so I guess this is to be expected but I'm starting to feel discouraged and wanting to stop testing not sure if I should keep going especially since I've already come so far or give myself and my body a break it's starting to become draining...just looking for opinions thanx